Dive master Exam Questions With Verified Answers

Dive master Exam Questions With Verified Answers Why does water absorb more heat than air? - answer- it is denser - it forms weaker bonds What takes away heat from the body... times faster than air - answer20 Refraction magnifies objects underwater by a ratio of ... - answer4:3 objects appear ... % closer and ... % larger underwater - answer25 %, 33% Light changes... as it passes through water - answerspeed, causing it to change direction slightly What is visual reversal? - answerin very clear water objects appear further away due to the particles in the water that resembles haze over great distance Sound travels slightly more than ... times faster in water than air - answer4 What determines how well sound travels through a substance? - answerElasticity- water has a higher elasticity than air so travels faster what is absolute absolute pressure - answerthe total pressure what is ambient pressure - answerthe surrounding pressure for every ... metres, the pressure increases by ... (plus one for the surface) - answer10, 1 for every ... meters in freshwater, the pressure increases by 1 - answer10.3 Double the surface pressure= - answerhalf the volume at a depth of 20 metres, what would the pressure and volume be? - answerPressure = 3 bar and volume = 1/3 full Double pressure.. - answerdouble the density (or half pressure = half the density) if we were diving 40 meters, the cylinder would only last ... of the time at the surface - answer1/5 What is the amount of buoyancy based off? - answerhow much fluid the object displaces compared to its weight how do you increase buoyancy? - answerreducing weight and increasing displacement how do we calculate partial pressure? - answermultiply the percentage of the gas by the pressure dpeth what is the partial pressure of oxygen set at? - answer1.4 bar for recreational diving what is saturation - answerthe pressure of the dissolved gas will equalize with the pressure of the gas in contact with the liquid What is supersaturation? - answerwhen pressure decreases the dissolved gas begins to come out of the solution what is dead air space and why is it a concern? - answergas that remains in ur sinuses and doesnt participate in gas exchange. When you breathe shallow and rapid the proportion of dead air space increases leading to increased carbon dioxide levels Why is carbon monoxide poisonous? - answerbecause it binds with haemoglobin (which oxygen normally binds too), reducing the ability to carry adeqaute oxygen around the body what are the two types of oxygen toxicity? - answer1. central nervous system toxicity 2. pulmonary toxicity what is the acronym used for CNS toxicity? - answerVentid visual disturbance ears ringing nausea twitching irritability dizziness why does gas narcosis occur? - answerresults from has blocking/delaying the transmission of signals within the nervous system which type of decompression sickness is the most life threatening? - answertype 2 DCS What are the signs of heat stroke? - answerPerspiration stops and the persons skin is hot and flush, pulse is rapid and strong